How do I remove site mailbox not manually? What I have tried so far:

  • Powershell remove-msoluser and remove-mailbox don't remove the app from SharePoint Online site. If you had a working mailbox and remove it with these cmdlets, you will start getting "Almost ready" and "Setting up" error messages after you click on the mailbox.
  • I tried accessing $context.Web.AllProperties and modify/deleting/removing these properties:

    $webProps = $context.Web.AllProperties
    $webProps.Set_Item("ExchangeTeamMailboxSiteCollectionUrl", $NULL)

None of the above had any effect and after the .ExecuteQuery() the properties are still there with the same values as before.

  • The site mailbox is not a list and cannot be removed as such from ListCollection of the site.

1 Answer 1


If the goal only to remove Site Mailbox settings, then you could try the following example:

Function Remove-WebProperty([Microsoft.SharePoint.Client.Web]$Web,[string]$Name)
    $webProperties = $Web.AllProperties
    if ($webProperties.FieldValues.ContainsKey($Name) -eq $true) {
        $webProperties[$Name] = $null

$context = New-Object Microsoft.SharePoint.Client.ClientContext($Url)
$context.Credentials = Get-SPOCredentials -UserName $UserName -Password $Password

$mailboxKeys = @("ExchangeTeamMailboxEmailAddress","ExchangeTeamMailboxSiteCollectionUrl","ExchangeTeamMailboxSiteID","ExchangeTeamMailboxSharePointUrl")
$mailboxKeys | ForEach-Object { Remove-WebProperty $context.Web $_ } 

  • Thank you, but no, the goal is to remove completely the app from SPO site. I just couldn't find a way and properties are sign of desperation. I'll try with some app GUID next.
    – grisha
    Dec 1, 2014 at 22:04

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